Clean laboratory ventilation mechanism

Abstract

The utility model relates to the related technical field of ventilation mechanisms, in particular to a clean laboratory ventilation mechanism which comprises a ventilation mechanism outer frame, a circular through groove is formed in the middle of the ventilation mechanism outer frame, a ventilation connecting frame is arranged in the through groove of the ventilation mechanism outer frame, and a ventilation plate body is arranged in the middle of the front end of the ventilation connecting frame. Sliding rails are arranged in the middles of the side edges of the front end and the rear end of the outer surface of the ventilation mechanism outer frame correspondingly, and a mechanism fixing plate is arranged at the end, away from the ventilation mechanism outer frame, of each sliding rail in a slotted mode. The improved clean laboratory ventilation mechanism is provided with an elastic clamping block and a moving track, the ventilation connecting frame can be pulled out by pressing the ventilation connecting frame and through slope extrusion of the elastic clamping block and a clamping block assembly, a filter plate connecting ring is pulled to slide upwards along the moving track, and then a filter plate assembly can be replaced through a screwdriver; therefore, a user can timely change the filtering mode of the laboratory ventilation mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field related to ventilation mechanisms, in particular to a ventilation mechanism for a clean laboratory. Background Art

[0002] During the work or experiment in the laboratory, some projects need to ensure the air circulation inside the laboratory, and some also need the air environment inside the laboratory to be dry or humid, so it is necessary to install a filtering structure on the ventilation mechanism;

[0003] The ventilation mechanism suitable for the laboratory needs to be easy to disassemble and assemble, and the filter components need to be able to be replaced in time so that the laboratory's experimental environment requirements can be guaranteed. The ventilation mechanism also needs to ensure that the air circulation into the laboratory can be gentle and windless.

[0004] In the process of realizing the utility model, the inventors found that the prior art had the following problems: 1. The traditional laboratory ventilation mechanism cannot replace the filter components for circulating air in time; 2. The traditional laboratory ventilation mechanism cannot be quickly disassembled and assembled on the surface of the laboratory wall. Utility Model Content

[0005] The purpose of the present utility model is to provide a clean laboratory ventilation mechanism to solve the problem that the traditional laboratory ventilation mechanism mentioned in the above background technology cannot replace the filter assembly and cannot be quickly disassembled. In order to achieve the above purpose, the present utility model provides the following technical solutions: a clean laboratory ventilation mechanism, including a ventilation mechanism outer frame, a circular through groove is opened in the middle of the ventilation mechanism outer frame, and a ventilation connection frame is arranged in the through groove of the ventilation mechanism outer frame, a ventilation plate body is arranged in the middle of the front end of the ventilation connection frame, and sliding tracks are arranged in the middle of the front and rear ends of the outer surface of the ventilation mechanism outer frame, and a mechanism fixing plate is arranged in the groove at one end of the sliding track away from the ventilation mechanism outer frame;

[0006] A group of ventilation plate fixing rings are provided at the middle of the front and rear sides of the upper and lower ends of the ventilation plate body, and a pipe connecting ring is provided at the middle of the rear side of the ventilation plate body, four rectangular through grooves are opened at equal intervals in the middle of the outer ring surface of the pipe connecting ring, and elastic snap-fit ​​blocks are provided inside the rectangular grooves, a filter plate connecting ring is provided at the middle of the rear side of the pipe connecting ring, and a filter plate assembly is provided at the middle of the inner wall of the filter plate connecting ring, and a snap-fit ​​block assembly is provided at one end of the elastic snap-fit ​​block away from the center of the filter plate assembly;

[0007] The left and right sides of the rear end surface of the filter plate connecting ring are provided with movable tracks, and the middle part of the rear end of the filter plate connecting ring is provided with an electric fan assembly, a serrated connecting ring is provided inside the front end of the electric fan assembly, and four rotating gears are provided at equal intervals in the middle part of the inner side of the serrated connecting ring, a connecting rack is provided in the middle part of one end of the rotating gear, and an arc-shaped locking arm is provided at one end of the connecting rack close to the outer ring of the electric fan assembly, and a rotating button is provided in the middle part of the front end of the rotating gear on the upper side.

[0008] Further preferably, a side surface of the sliding track close to the ventilation mechanism outer frame is fixed to the middle of the outer surface of the ventilation mechanism outer frame by screws, and a sliding groove is provided in the middle of the surface on the other side of the sliding track, and one end of the mechanism fixing plate close to the sliding track is slidably connected to the inner wall of the sliding groove of the sliding track, and fixing grooves are provided on both sides of the middle of the sliding groove of the sliding track close to the front and rear ends of the ventilation mechanism outer frame, and springs are connected to both sides of the middle surface of one side of the mechanism fixing plate close to the middle of the ventilation mechanism outer frame by screws, and the other ends of the springs are fixed to the inner wall of the sliding groove of the sliding track, and the part of the mechanism fixing plate located inside the fixing groove of the sliding track is slidably connected to the inner wall of the fixing groove.

[0009] Further preferably, the cross-sectional diameter of the outer ring of the ventilation connecting frame is equal to the cross-sectional diameter of the circular groove in the middle of the outer frame of the ventilation mechanism, and arc-shaped grooves are provided in the middle of the upper and lower ends of the inner wall of the ventilation connecting frame, and the left and right sides of one end of the ventilation plate fixing ring close to the inner wall of the ventilation connecting frame are fixed to the inner wall of the arc-shaped groove of the ventilation connecting frame by telescopic rods, the front and rear surfaces of the middle part of the upper and lower ends of the ventilation plate main body are tightly attached to the front and rear sides of the inner wall of the ventilation plate fixing ring, and the front end surface of the pipe connecting ring is fixed to the middle of the rear end surface of the ventilation connecting frame by screws.

[0010] Further preferably, the portion of the elastic snap-fit ​​block located in the rectangular groove of the pipe connecting ring is slidably connected to the inner wall of the rectangular groove of the pipe connecting ring, and the end of the elastic snap-fit ​​block close to the center of the pipe connecting ring is fixed with a spring telescopic rod, and the other end of the spring telescopic rod is fixed to the inner wall of the rectangular groove of the pipe connecting ring, the slope surface on the other side of the elastic snap-fit ​​block is tightly attached to the slope surface of one end of the snap-fit ​​block assembly close to the elastic snap-fit ​​block, and the middle part of the other end of the snap-fit ​​block assembly is connected to the inner wall of the inner wall groove of the outer frame of the ventilation mechanism through a spring telescopic rod.

[0011] Further preferably, the front end surface of the filter plate connecting ring is tightly attached to the rear end surface of the pipe connecting ring, and the outer ring surface of the filter plate assembly is fixed to the middle part of the inner wall surface of the filter plate connecting ring by screws, and the middle parts of the left and right sides of the rear end of the filter plate connecting ring are slidably connected to the inner wall of the slide groove of the movable track by sliding buttons, and the upper and lower ends of the movable track are fixed to the rear side surface of the middle part of the connecting cross bar inside the circular groove of the outer frame of the ventilation mechanism by screws, and the rear end surface of the electric fan assembly is fixed to the middle part of the front end surface of the ventilation connecting frame on the rear side.

[0012] Further preferably, a circular groove is provided in the middle part of the upper side of the front end surface of the electric fan assembly, and the middle part of the rotating button passes through the bearing and is connected to the inner wall of the circular groove of the electric fan assembly, and the rear end of the rotating button is fixed to the middle part of the front end surface of the rotating gear, the middle part of the rear end of the rotating gear is connected to the upper end of the rear side of the inner wall of the electric fan assembly, and four groups of sawtooth blocks are fixed at equal intervals on the inner ring surface of the sawtooth connecting ring, and the middle part of one end of the front side of the rotating gear close to the outer ring of the electric fan assembly is meshed and connected to the middle part of the sawtooth block of the inner ring of the sawtooth connecting ring.

[0013] Further preferably, the front and rear ends of the serrated connecting ring are bearingly connected to the front end inner wall of the electric fan assembly, and the middle part of one end of the rear side of the rotating gear close to the connecting rack is meshed and connected to the middle part of the connecting rack, and the rear end of the connecting rack is slidably connected to the rear side of the front end inner wall of the electric fan assembly, one end of the connecting rack close to the arc-shaped locking arm is fixed to the middle part of one side surface of the arc-shaped locking arm close to the connecting rack, and the other end of the connecting rack is connected to the middle part of the front end inner wall of the electric fan assembly through a spring, and the other side arc surface of the arc-shaped locking arm is slidably connected to the rear end of the inner wall of the outer frame of the ventilation mechanism.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] In the utility model, an elastic snap-fit ​​block and a movable track are provided. By pressing the ventilation connection frame and squeezing and releasing the elastic snap-fit ​​block and the slope of the snap-fit ​​block assembly, the ventilation connection frame can be pulled out, and the filter plate connection ring can be pulled to slide up along the movable track, and then the filter plate assembly can be replaced by a screwdriver, thereby completing the replacement of the filter plate assembly, so that the user can timely change the filtering mode of the laboratory ventilation mechanism.

[0016] In the utility model, a sliding track and a mechanism fixing plate are provided. The sliding track is installed on the side edges of the front and rear ends of the outer frame of the ventilation mechanism, and the mechanism fixing plate is provided in the slide groove of the sliding track. The mechanism fixing plate can be slid so that the mechanism fixing plate can be tightly attached to the surface of the laboratory wall, and the mechanism fixing plate can be fixed by bolts. At the same time, a connecting cross bar is fixed on the outer surface of the ventilation connecting frame, so that the user can remove the main structure of the ventilation mechanism by pulling the ventilation connecting frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is an enlarged structural diagram of the ventilation connection frame of the utility model;

[0019] Figure 3 This is an enlarged structural diagram of the fixing plate of the utility model mechanism;

[0020] Figure 4 This is an enlarged structural diagram of the electric fan assembly of the utility model;

[0021] Figure 5 For this utility model Figure 4 The enlarged structural diagram at A in the middle;

[0022] Figure 6 It is an enlarged structural diagram of the locking block assembly of the utility model.

[0023] In the figure: 1. Ventilation mechanism outer frame; 2. Ventilation connecting frame; 3. Ventilation plate body; 4. Sliding track; 5. Mechanism fixing plate; 6. Ventilation plate fixing ring; 7. Pipe connecting ring; 8. Filter plate assembly; 9. Elastic snap-fit ​​block; 10. Filter plate connecting ring; 11. Electric fan assembly; 12. Moving track; 13. Sawtooth connecting ring; 14. Arc snap-fit ​​arm; 15. Connecting rack; 16. Rotating button; 17. Rotating gear; 18. Snap-fit ​​block assembly. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figures 1 to 6The utility model provides a technical solution: a clean laboratory ventilation mechanism, comprising a ventilation mechanism outer frame 1, a circular through groove is opened in the middle of the ventilation mechanism outer frame 1, and a ventilation connection frame 2 is arranged in the through groove of the ventilation mechanism outer frame 1, a ventilation plate body 3 is arranged in the middle of the front end of the ventilation connection frame 2, and sliding tracks 4 are arranged in the middle of the sides of the front and rear ends of the outer surface of the ventilation mechanism outer frame 1, and a mechanism fixing plate 5 is arranged in a groove at one end of the sliding track 4 away from the ventilation mechanism outer frame 1;

[0026] A set of ventilation plate fixing rings 6 are provided at the middle of both front and rear sides of the upper and lower ends of the ventilation plate body 3, and a pipe connecting ring 7 is provided at the middle of the rear side of the ventilation plate body 3, four rectangular through grooves are opened at equal intervals in the middle of the outer ring surface of the pipe connecting ring 7, and elastic snap-fit ​​blocks 9 are provided inside the rectangular grooves, a filter plate connecting ring 10 is provided at the middle of the rear side of the pipe connecting ring 7, and a filter plate assembly 8 is provided at the middle of the inner wall of the filter plate connecting ring 10, and a snap-fit ​​block assembly 18 is provided at one end of the elastic snap-fit ​​block 9 away from the center of the filter plate assembly 8;

[0027] Movable tracks 12 are provided on both sides of the rear end surface of the filter plate connecting ring 10, and an electric fan assembly 11 is provided in the middle of the rear end of the filter plate connecting ring 10, a serrated connecting ring 13 is provided inside the front end of the electric fan assembly 11, and four rotating gears 17 are provided at equal intervals in the middle of the inner side of the serrated connecting ring 13, a connecting rack 15 is provided in the middle of one end of the rotating gear 17, and an arc-shaped locking arm 14 is provided at one end of the connecting rack 15 close to the outer ring of the electric fan assembly 11, and a rotating button 16 is provided in the middle of the front end of the upper rotating gear 17.

[0028] In this embodiment, Figure 3 As shown, a side surface of the sliding track 4 close to the ventilation mechanism outer frame 1 is fixed to the middle of the outer surface of the ventilation mechanism outer frame 1 by screws, and a sliding groove is opened in the middle of the surface of the other side of the sliding track 4, and one end of the mechanism fixing plate 5 close to the sliding track 4 is slidably connected to the inner wall of the sliding groove of the sliding track 4, and both sides of the middle of the sliding groove of the sliding track 4 close to the front and rear ends of the ventilation mechanism outer frame 1 are provided with fixing grooves, and the two sides of the middle of one side of the mechanism fixing plate 5 close to the middle of the ventilation mechanism outer frame 1 are connected with springs by screws, and the other ends of the springs are fixed to the inner wall of the sliding groove of the sliding track 4, and the part of the mechanism fixing plate 5 located inside the fixing groove of the sliding track 4 is slidably connected to the inner wall of the fixing groove; the ventilation mechanism outer frame 1 can be fixed as a whole on the surface of the laboratory wall by the mechanism fixing plate 5 slidably connected to the inside of the sliding groove of the sliding track 4.

[0029] In this embodiment, Figure 2As shown, the cross-sectional diameter of the outer ring of the ventilation connecting frame 2 is equal to the cross-sectional diameter of the circular groove in the middle of the ventilation mechanism outer frame 1, and arc-shaped grooves are provided in the middle of the upper and lower ends of the inner wall of the ventilation connecting frame 2, and the left and right sides of one end of the ventilation plate fixing ring 6 close to the inner wall of the ventilation connecting frame 2 are fixed to the inner wall of the arc-shaped groove of the ventilation connecting frame 2 by telescopic rods, and the front and rear surfaces of the middle of the upper and lower ends of the ventilation plate main body 3 are tightly attached to the front and rear sides of the inner wall of the ventilation plate fixing ring 6, and the front end surface of the pipe connecting ring 7 is fixed to the middle of the rear end surface of the ventilation connecting frame 2 by screws; by fixing the ventilation plate fixing ring 6 on the upper and lower sides of the ventilation connecting frame 2, the user can clamp and fix the ventilation plate main body 3 in the middle of the ventilation connecting frame 2, so that the air circulation can be more moderate.

[0030] In this embodiment, Figure 6 As shown, the part of the elastic snap-fit ​​block 9 located in the rectangular groove of the pipe connecting ring 7 is slidably connected to the inner wall of the rectangular groove of the pipe connecting ring 7, and the end of the elastic snap-fit ​​block 9 close to the center of the pipe connecting ring 7 is fixed with a spring telescopic rod, and the other end of the spring telescopic rod is fixed to the inner wall of the rectangular groove of the pipe connecting ring 7, the slope surface on the other side of the elastic snap-fit ​​block 9 is tightly attached to the slope surface of one end of the snap-fit ​​block assembly 18 close to the elastic snap-fit ​​block 9, and the middle part of the other end of the snap-fit ​​block assembly 18 is connected to the inner wall of the inner wall groove of the ventilation mechanism outer frame 1 through the spring telescopic rod; through the slope extrusion connection of the elastic snap-fit ​​block 9 and the snap-fit ​​block assembly 18, the ventilation mechanism main body can be snapped into the inside of the ventilation mechanism outer frame 1 through the elastic snap-fit ​​block 9 in the rectangular groove of the pipe connecting ring 7.

[0031] In this embodiment, Figure 2 As shown, the front end surface of the filter plate connecting ring 10 is tightly attached to the rear end surface of the pipe connecting ring 7, and the outer ring surface of the filter plate assembly 8 is fixed to the middle part of the inner wall surface of the filter plate connecting ring 10 by screws, and the middle parts of the left and right sides of the rear end of the filter plate connecting ring 10 are slidably connected to the inner wall of the slide groove of the movable track 12 by sliding buttons, and the upper and lower ends of the movable track 12 are fixed to the rear side surface of the middle part of the connecting cross bar inside the circular groove of the ventilation mechanism outer frame 1 by screws, and the rear end surface of the electric fan assembly 11 is fixed to the middle part of the front end surface of the rear ventilation connecting frame 2; by pulling the filter plate connecting ring 10, the filter plate connecting ring 10 can slide out along the movable track 12, and the filter plate assembly 8 inside the filter plate connecting ring 10 is replaced by a screwdriver to complete the replacement of the filter system.

[0032] In this embodiment, Figure 4As shown, a circular groove is provided in the middle of the upper side of the front end surface of the electric fan assembly 11, and the middle part of the rotating button 16 passes through the bearing and is connected to the inner wall of the circular groove of the electric fan assembly 11, and the rear end of the rotating button 16 is fixed to the middle of the front end surface of the rotating gear 17, and the middle part of the rear end of the rotating gear 17 is connected to the upper end of the rear side of the inner wall of the electric fan assembly 11 by a bearing, and four groups of sawtooth blocks are fixed at equal intervals on the inner ring surface of the sawtooth connecting ring 13, and the middle part of one end of the front side of the rotating gear 17 close to the outer ring of the electric fan assembly 11 is meshed and connected to the middle part of the sawtooth block of the inner ring of the sawtooth connecting ring 13; the rotating button 16 at the front end of the electric fan assembly 11 is rotated to drive the rotating gear 17 to rotate, so that the sawtooth connecting ring 13 meshed with the end of the rotating gear 17 can rotate.

[0033] In this embodiment, Figure 4 and Figure 5 As shown, the front and rear ends of the serrated connecting ring 13 are bearing-connected to the front inner wall of the electric fan assembly 11, and the middle part of one end of the rear side of the rotating gear 17 close to the connecting rack 15 is meshed and connected to the middle part of the connecting rack 15, and the rear end of the connecting rack 15 is slidably connected to the rear side of the front inner wall of the electric fan assembly 11, one end of the connecting rack 15 close to the arc-shaped locking arm 14 is fixed to the middle part of one side surface of the arc-shaped locking arm 14 close to the connecting rack 15, and the other end of the connecting rack 15 is connected to the middle part of the front inner wall of the electric fan assembly 11 through a spring, and the other side arc surface of the arc-shaped locking arm 14 is slidably connected to the rear end of the inner wall of the ventilation mechanism outer frame 1; the rotation of the serrated block on the inner ring of the serrated connecting ring 13 can drive the rotating gear 17 to rotate, thereby enabling the connecting rack 15 to slide along the inner wall of the electric fan assembly 11.

[0034] The use method and advantages of the utility model: When the clean laboratory ventilation mechanism is used, the working process is as follows:

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, first, the user can slide the mechanism fixing plate 5 into the slide groove of the sliding track 4, and at the same time, make the slider at the end of the mechanism fixing plate 5 engage into the fixing groove, and connect the spring inside the upper slide groove by screws, and then fix the mechanism fixing plate 5 to the surface of the laboratory wall by bolts. At the same time, the ventilation plate fixing ring 6 inside the ventilation connection frame 2 can be pressed, and the ventilation plate main body 3 can be engaged with the middle part of the ventilation plate fixing ring 6. At the same time, the ventilation connection frame 2 can be pressed so that the slope bottom surface of the elastic locking block 9 can support the locking block assembly 18, and the ventilation connection frame 2 can be pulled out through the connecting cross bar, and the filter plate connecting ring 10 can be pulled so that the filter plate connecting ring 10 can slide upward along the moving track 12, and the filter plate assembly 8 can be replaced by screws, and then the filter plate connecting ring 10 is put down so that the front end of the filter plate connecting ring 10 can be close to the rear end surface of the pipe connecting ring 7. After pushing back the ventilation connection frame 2, the electric fan assembly 11 can be started, so that the ventilation mechanism starts working;

[0036] When installing the electric fan assembly 11, the rotating button 16 at the end of the electric fan assembly 11 can be rotated so that the rotating button 16 can drive the rotating gear 17 to rotate, and the serrated connecting ring 13 can be driven to rotate through the front end of the rotating gear 17, so that the serrated connecting ring 13 can drive the remaining three groups of rotating gears 17 to rotate through the serrated block, and then the connecting rack 15 can slide along the inner wall of the electric fan assembly 11, and drive the arc-shaped locking arm 14 to lock into the inner wall of the ventilation mechanism outer frame 1, so that the electric fan assembly 11 can be more stable during operation.

[0037] The above shows and describes the basic principle, main features and advantages of the utility model. Technical staff in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A clean laboratory ventilation mechanism, comprising a ventilation mechanism outer frame (1), characterized in that: A circular through groove is provided in the middle of the ventilation mechanism outer frame (1), and a ventilation connection frame (2) is arranged in the through groove of the ventilation mechanism outer frame (1), a ventilation plate body (3) is arranged in the middle of the front end of the ventilation connection frame (2), and sliding rails (4) are arranged in the middle of the front and rear ends of the outer surface of the ventilation mechanism outer frame (1), and a mechanism fixing plate (5) is arranged in a groove at one end of the sliding rail (4) away from the ventilation mechanism outer frame (1); A group of ventilation plate fixing rings (6) are arranged at the middle of the front and rear sides of the upper and lower ends of the ventilation plate body (3), and a pipe connecting ring (7) is arranged at the middle of the rear side of the ventilation plate body (3). Four rectangular through grooves are opened at equal intervals in the middle of the outer ring surface of the pipe connecting ring (7), and elastic snap-fit ​​blocks (9) are arranged inside the rectangular grooves. A filter plate connecting ring (10) is arranged at the middle of the rear side of the pipe connecting ring (7), and a filter plate assembly (8) is arranged at the middle of the inner wall of the filter plate connecting ring (10), and a snap-fit ​​block assembly (18) is arranged at one end of the elastic snap-fit ​​block (9) away from the center of the filter plate assembly (8). The rear end surface of the filter plate connecting ring (10) is provided with movable tracks (12) on both sides, and the middle part of the rear end of the filter plate connecting ring (10) is provided with an electric fan assembly (11), the front end of the electric fan assembly (11) is provided with a sawtooth connecting ring (13), and the inner middle part of the sawtooth connecting ring (13) is provided with four rotating gears (17) at equal intervals, the middle part of one end of the rotating gear (17) is provided with a connecting rack (15), and the end of the connecting rack (15) close to the outer ring of the electric fan assembly (11) is provided with an arc-shaped locking arm (14), and the middle part of the front end of the rotating gear (17) on the upper side is provided with a rotating button (16).

2. A clean laboratory ventilation mechanism according to claim 1, characterized in that: The surface of one side of the sliding track (4) close to the ventilation mechanism outer frame (1) is fixed to the middle of the outer surface of the ventilation mechanism outer frame (1) by screws, and a sliding groove is provided in the middle of the surface of the other side of the sliding track (4), and one end of the mechanism fixing plate (5) close to the sliding track (4) is slidably connected to the inner wall of the sliding groove of the sliding track (4), and both sides of the middle of the sliding groove of the sliding track (4) close to the front and rear ends of the ventilation mechanism outer frame (1) are provided with fixing grooves, and the surface of the middle of one side of the mechanism fixing plate (5) close to the middle of the ventilation mechanism outer frame (1) is connected to springs by screws, and the other ends of the springs are fixed to the inner wall of the sliding groove of the sliding track (4), and the part of the mechanism fixing plate (5) located inside the fixing groove of the sliding track (4) is slidably connected to the inner wall of the fixing groove.

3. A clean laboratory ventilation mechanism according to claim 1, characterized in that: The cross-sectional diameter of the outer ring of the ventilation connection frame (2) is equal to the cross-sectional diameter of the circular groove in the middle of the ventilation mechanism outer frame (1), and arc-shaped grooves are provided in the middle of the upper and lower ends of the inner wall of the ventilation connection frame (2), and the left and right sides of one end of the ventilation plate fixing ring (6) close to the inner wall of the ventilation connection frame (2) are fixed to the inner wall of the arc-shaped groove of the ventilation connection frame (2) by telescopic rods, and the front and rear side surfaces of the middle of the upper and lower ends of the ventilation plate body (3) are tightly attached to the front and rear sides of the inner wall of the ventilation plate fixing ring (6), and the front end surface of the pipe connection ring (7) is fixed to the middle of the rear end surface of the ventilation connection frame (2) by screws.

4. A clean laboratory ventilation mechanism according to claim 1, characterized in that: The portion of the elastic snap-fit ​​block (9) located in the rectangular groove of the pipe connecting ring (7) is slidably connected to the inner wall of the rectangular groove of the pipe connecting ring (7), and one end of the elastic snap-fit ​​block (9) close to the center of the pipe connecting ring (7) is fixed with a spring telescopic rod, and the other end of the spring telescopic rod is fixed to the inner wall of the rectangular groove of the pipe connecting ring (7), the slope surface on the other side of the elastic snap-fit ​​block (9) is tightly attached to the slope surface of one end of the snap-fit ​​block assembly (18) close to the elastic snap-fit ​​block (9), and the middle part of the other end of the snap-fit ​​block assembly (18) is connected to the inner wall of the inner wall groove of the outer frame (1) of the ventilation mechanism through the spring telescopic rod.

5. A clean laboratory ventilation mechanism according to claim 1, characterized in that: The front end surface of the filter plate connecting ring (10) is tightly attached to the rear end surface of the pipe connecting ring (7), and the outer ring surface of the filter plate assembly (8) is fixed to the middle of the inner wall surface of the filter plate connecting ring (10) by screws, and the middle of the left and right sides of the rear end of the filter plate connecting ring (10) are slidably connected to the inner wall of the slide groove of the movable track (12) by sliding buttons, and the upper and lower ends of the movable track (12) are fixed to the rear side surface of the middle part of the connecting cross bar inside the circular groove of the ventilation mechanism outer frame (1) by screws, and the rear end surface of the electric fan assembly (11) is fixed to the middle of the front end surface of the ventilation connection frame (2) on the rear side.

6. A clean laboratory ventilation mechanism according to claim 1, characterized in that: A circular groove is provided in the middle of the upper side of the front end surface of the electric fan assembly (11), and the middle of the rotating button (16) passes through the bearing and is connected to the inner wall of the circular groove of the electric fan assembly (11), and the rear end of the rotating button (16) is fixed to the middle of the front end surface of the rotating gear (17), and the middle of the rear end of the rotating gear (17) is connected to the upper end of the rear side of the inner wall of the electric fan assembly (11) by a bearing, and four groups of sawtooth blocks are fixed at equal intervals on the inner ring surface of the sawtooth connecting ring (13), and the middle of one end of the front side of the rotating gear (17) close to the outer ring of the electric fan assembly (11) is meshed and connected to the middle of the sawtooth block of the inner ring of the sawtooth connecting ring (13).

7. A clean laboratory ventilation mechanism according to claim 1, characterized in that: The front and rear ends of the sawtooth connecting ring (13) are bearing-connected to the front inner wall of the electric fan assembly (11), and the middle part of one end of the rear side of the rotating gear (17) close to the connecting rack (15) is meshed and connected to the middle part of the connecting rack (15), and the rear end of the connecting rack (15) is slidably connected to the rear side of the front inner wall of the electric fan assembly (11), one end of the connecting rack (15) close to the arc-shaped engaging arm (14) is fixed to the middle part of one side surface of the arc-shaped engaging arm (14) close to the connecting rack (15), and the other end of the connecting rack (15) is connected to the middle part of the front inner wall of the electric fan assembly (11) through a spring, and the other side arc surface of the arc-shaped engaging arm (14) is slidably connected to the rear end of the inner wall of the ventilation mechanism outer frame (1).

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